chore(deps): update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/ci.yml

@@ -18,7 +18,7 @@ jobs:
         node: [ 20, 22, 24 ]
     name: Build and test with Node ${{ matrix.node }}
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - uses: ./.github/actions/node
       with:
         node-version-override: ${{ matrix.node }}
@@ -30,7 +30,7 @@ jobs:
     runs-on: ubuntu-latest
     name: Test against GraphQL 17 alpha with incremental delivery
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - uses: ./.github/actions/node
     - run: npm i --legacy-peer-deps graphql@17.0.0-alpha.2
     - run: npm test
@@ -41,23 +41,23 @@ jobs:
     runs-on: ubuntu-latest
     name: Prettier
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - uses: ./.github/actions/node
     - run: npm run prettier-check
 
   lint:
     runs-on: ubuntu-latest
     name: Lint
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - uses: ./.github/actions/node
     - run: npm run lint
 
   spell-check:
     runs-on: ubuntu-latest
     name: Spell Check
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - uses: ./.github/actions/node
     - run: npm run spell-check
 
@@ -70,7 +70,7 @@ jobs:
     name: Changesets
     if: ${{ (! startsWith(github.head_ref, 'changeset-release/')) && (!contains(github.event.pull_request.labels.*.name, 'no-changeset-needed')) }}
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
       with:
         # This makes Actions fetch all Git history so that Changesets can generate changelogs with the correct commits
         fetch-depth: 0

.github/workflows/release-pr.yml

@@ -15,7 +15,7 @@ jobs:
       id-token: write
     steps:
       - name: Checkout Repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           # This makes Actions fetch all Git history so that Changesets can generate changelogs with the correct commits
           fetch-depth: 0